Adjustable type upright rod of small crane

The utility model relates to an adjustable type upright rod of a small crane. Compared with the prior art, the adjustable type upright rod of the small crane solves the problem that the existing small crane upright rod cannot be adapted to different application environments. The adjustable type upright rod of the small crane comprises a main machine base (13) and an upright post sleeve (14) arranged on the main machine base (13), and further comprises an upper upright rod (2), a middle upright rod (4) and a lower upright rod (15), wherein the upper upright rod (2) is arranged at the upper part of the middle upright rod (4) by an internal joint (3); the lower part of the middle upright rod (4) is sleeved on a lifting jack screw (17) and supported and fixed by the a screw nut (11) of the lifting jack screw (17); the lower part of the lifting jack screw (17) is sleeved in the lower upright rod (15); and the lower upright rod (5) is sleeved in the upright post sleeve (14). The adjustable type upright post disclos